I find it quite interesting that really the only solutions to problems like this are, "Don't go to the guarded town." and "Make a ton of alts." Somehow I think this is sort of defeating the purpose. Do I have a better answer, no sadly not with the game mechanics the way they are. But this is something that should be taken a look at, I love the freedom in this game but all that freedom comes at a very high cost, a cost only a small percentage are paying.
I get what Avv is saying about taking the fight to them, but sadly because the way the game is, killing them will only result in them either making them wait a few mins, or make another alt. Because of the rewards for being a douche they won't stop.